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    <title>&lt;mo&gt; with a single character and children (reference)</title>
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      math { font: 50px/1 Ahem; }
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    <p>There should be 5/18em horizontal gaps around the middle rectangles:</p>
    <p><math><mn>p</mn><mo><span>X</span></mo><mn>p</mn></math></p>
    <p><math><mn>p</mn><mo>X<span></span></mo><mn>p</mn></math></p>
    <p><math><mn>p</mn><mo><span></span>X</mo><mn>p</mn></math></p>
    <p><math><mn>p</mn><mo id="dynamic-add">X</mo><mn>p</mn></math></p>
    <p><math><mn>p</mn><mo id="dynamic-text-add">XX</mo><mn>p</mn></math></p>

    <p>There should be no horizontal gap around the middle rectangles:</p>

    <p><math><mn>p</mn><mo stretchy="false" lspace="0" rspace="0">X</mo><mn>p</mn></math></p>
    <p><math><mn>p</mn><mo id="dynamic-remove" stretchy="false" lspace="0" rspace="0"><span></span>X</mo><mn>p</mn></math></p>
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